<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<script src="https://unpkg.com/vue@next"></script>

<div id="is-show">
    <span v-if="seen"> hello vue3</span>
</div>

<script>
    const vueApp = {
        data(){
            return {
                seen: true
            }
        }
    }

    Vue.createApp(vueApp).mount('#is-show')
</script>
</body>
</html>
